We are working on new slash sheets for Lead-Free. The general consensus is
that a non-dicey FR4 with a minimum of 155 degrees C Tg, a minimum decomp
temperature of 340 degrees C, 0.5% moisture content, a maximum of 3.5% Z
axis expansion, good CAF resistance and improved numbers on T-288 tests will
work for thicker multi-layer High-Rel PWBs.
Dewey

-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Dennis Bang
Sent: Sunday, March 06, 2005 8:20 PM
To: [log in to unmask]
Subject: [LF] Tg-Td


Dear all,

I'm wondering if there is a general consensus when it comes to selecting a
laminate material for PCBs for Lead Free. Is the standard FR4 Tg 130C
adequate for Lead Free or would we need to move towards a higher grade
>Tg170.

I'm a little confused in that some say it is required to move to the higher
Tg to accomodate for the higher Assembly temperature while others say Tg
170C is unnecessary. Are people moving towards to the higher Tg as an
assurance or is it a requirement for the higher processing temperature?


Kind Regards
Dennis Bang


#################################################
***** CONFIDENTIAL *****
We apologise if this message has been sent to you in error.  We are
committed to protecting the confidential information of our customers,
our vendors and GPC Electronics.  If you have received this message in
error, we would appreciate you removing it from your system and
informing us of the error, so that we may continue to improve our
processes.
Please note that whilst we check our outgoing mail, you should also
check any attachments for viruses and defects before opening them or
sending them on.
Thank you.
#################################################

----------------------------------------------------------------------------
---Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send:
SET Leadfree NOMAIL/(MAIL)
Search previous postings at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
----------------------------------------------------------------------------
---

-------------------------------------------------------------------------------Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL)
Search previous postings at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-------------------------------------------------------------------------------